问题描述

[!] HTTP Host Availability
    ✗ HTTP host https://maven.google.com/ is not reachable. Reason: An error
      occurred while checking the HTTP host: Operation timed out

解决方案

1. 将文件flutter/packages/flutter_tools/lib/src/http_host_validator.dart中的https://maven.google.com/改为https://dl.google.com/dl/android/maven2/。

% vim flutter/packages/flutter_tools/lib/src/http_host_validator.dart

2. 删除flutter/bin/cache。

% rm -fr flutter/bin/cache 

4. 执行flutter doctor。

% flutter doctor          
Downloading Dart SDK from Flutter engine 57d3bac3dd5cb5b0e464ab70e7bc8a0d8cf083ab...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  209M  100  209M    0     0  3968k      0  0:00:54  0:00:54 --:--:-- 3448k
Building flutter tool...
╔════════════════════════════════════════════════════════════════════════════╗
║ A new version of Flutter is available!                                     ║
║                                                                            ║
║ To update to the latest version, run "flutter upgrade".                    ║
╚════════════════════════════════════════════════════════════════════════════╝


Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure
you trust this source!
Downloading Material fonts...                                    2,003ms
Downloading Gradle Wrapper...                                      112ms
Downloading package sky_engine...                                  621ms
Downloading flutter_patched_sdk tools...                         2,298ms
Downloading flutter_patched_sdk_product tools...                 1,289ms
Downloading darwin-x64 tools...                                    10.2s
Downloading libimobiledevice...                                    118ms
Downloading usbmuxd...                                              94ms
Downloading libplist...                                             87ms
Downloading openssl...                                             416ms
Downloading ios-deploy...                                          107ms
Downloading darwin-x64/font-subset tools...                        394ms
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.5, on macOS 12.7.1 21G920 darwin-x64, locale
    zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for
      more details.
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.1)
[✓] VS Code (version 1.56.2)
[✓] Connected device (2 available)
[✓] HTTP Host Availability

! Doctor found issues in 1 category.